Synchronous Microflares and Their Interpretation on the Basis of Generalized Topological Model

An interesting phenomenon that can be identified in the images of the solar chromosphere in CaII line recorded by Hinode/SOT instrument are the short-lived synchronous flaring arcs, which are well separated from each other. One of interpretations of this effect might be based on the generalized ‘‘topological’’ (or, more exactly, ‘‘nonlocal’’) model of magnetic reconnection, where the magnetic null points are formed by a specific superposition of actions by the distant sources (e.g., sunspots) rather than by the local electric currents. In the simplest case, the topological model can be pictorially represented by the two flipping dome-shaped surfaces (separatrixes of the global magnetic field), where the magnetic reconnection and the respective heat release is initiated by a magnetic null point quickly traveling along an arc at the intersection of two domes. As shown in the present paper, a natural generalization of this model might be a three-dome separatrix structure of the magnetic field, whose flipping results in the formation of two running null points and, correspondingly, two synchronous glaring arcs.